I don't come in the boot loader mode (Jamin is dead)

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I try the hard reset but they dont't help.
I don't come in the boot loader mode, only if i connect the device to the power supply it works but now i haven't a connecting to the PC.

If i not connected to the power suppley and press now and hold continuously at the camera button and press the power button once there is now boot loader i see only for one moment

a white screen and also for one moment the blue light in the speaker



if you find this solution of the problem , Please help me !

you have to charge yor battery on another working device then you will be able to entr the boot loader and stay there

try to force BootScreen press and hold comm. manager and reset botton.
Good Luck